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Patent Searching and Data


Title:
TENSION DETECTOR FOR ROD, ETC.
Document Type and Number:
Japanese Patent JPS5685019
Kind Code:
A
Abstract:

PURPOSE: To rapidly detect the lowering of tension in rod, etc., by providing a display plate popping up when the tension of rod, etc., is lowered to a rod, etc., for lock bolt used in earth anchoring work.

CONSTITUTION: After burying a rod 1 under the ground, a large washer 4, an elastic device 7, a small washer 11, and a nut 6 are attached in order, a display plate 8 is inserted while pressing on the small washer 11 by jack, etc., by causing a reaction force in the rod 1, and then the display plate 8 is fixed by being pressed further by the jack to an extent that it is not popped out. When the lowering of tension (loosing) occurs in the rod 1, the elastic device 7 is floated according to the elasticity of the device 7 and then the display plate 8 is popped up within the length range of a yarn 10 by means of the repulsion of a spring 9 set inside the groove 5 of the large washer 4.


Inventors:
NAKAYAMA ATSUSHI
SAMEJIMA TERUYUKI
Application Number:
JP16203879A
Publication Date:
July 10, 1981
Filing Date:
December 13, 1979
Export Citation:
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Assignee:
SAKATA DENKI KK
International Classes:
F16B31/00; E02D5/76; E02D5/80; E21D20/00; E21D21/00; G01L5/00; (IPC1-7): E02D5/80; E21D21/00